WTAQ -- A Computer Program for Aquifer-Test Analysis of Confined and Unconfined Aquifers
by Paul M. Barlow, (U.S. Geological Survey, 10 Bearfoot Road, Northborough, MA 01532) and Allen F. Moench, (U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025)
Section: Computer-Based Analysis of Aquifer and Well Components, pp. 1-9, (doi: http://dx.doi.org/10.1061/40517(2000)366)
Access full text
Purchase Subscription
Permissions for Reuse 
| Document type: |
Conference Proceeding Paper |
| Part of: |
Building Partnerships |
| Abstract: |
Computer program WTAQ was developed to implement a Laplace-transform analytical solution for axial-symmetric flow to a partially penetrating, finite-diameter well in a homogeneous and anisotropic unconfined (water-table) aquifer. The solution accounts for well-bore storage and skin effects at the pumped well, delayed response at an observation well, and delayed or instantaneous drainage from the unsaturated zone. For the particular case of zero drainage from the unsaturated zone, the solution simplifies to that of axial-symmetric flow in a confined aquifer. WTAQ calculates theoretical time-drawdown curves for the pumped well and observation wells and piezometers. The theoretical curves are used with measured time-drawdown data to estimate hydraulic parameters of confined or unconfined aquifers by graphical type-curve methods or by automatic parameter-estimation methods. Parameters that can be estimated are horizontal and vertical hydraulic conductivity, specific storage, and specific yield. A sample application illustrates use of WTAQ for estimating hydraulic parameters of a hypothetical, unconfined aquifer by type-curve methods. |
|
